170 LIMNiEADiE. 



Catalog, p. 5G, pi. 21, f. 17. — Turt. Concli. Diction, p. G!5. 

 — CiiEMN. Conch. Cab, vol. ix. pt. 2, p. 171, pi. 135, 

 f. 1241, 1242.— Wood, Index Testaceolog. pi. 35, f. 186. 

 — DiLLVV. Recent Shells, vol. ii. p. 969 (not var.). 

 Buccimim auricula, 'Mvi.i.'E.R, Hist. Verm. pt. 2, p. 126. — Wolf in Stuiin, 



Deutsch. Fauna, sect. vi. pt. 1. 

 Turho paiulus,'DA Costa, Brit. Conch, p. 95, pi. 5, f. 17. 

 Bulivms uuricularius, Brug. Encycl. Meth. Vers, vol. i. p. 304. 

 Limneus „ Drap. Moll. Ter. et Fluv. France, p. 49, pi. 2, f. 28, 29, 32. 



— Jeffreys, Trans. Linn. See. vol, xvi, p. 372. — Turt. 

 Manual L. and F.W. Shells, p. 117, f, 100.— Thompson, 

 Ann. Nat. Hist, vol. vi. p. 117,— Kickx, Moll. Brabant. 

 Austral, p. 50". 

 LymiuMS „ Brard, Coq. Paris, p. 1 40, pi. 5, f. 23. 



Lymncea auricularia, Lamarck, Anim. s. Vert. (cd. Desh.) vol. viii. p. 41 1. — 

 Bkown, Illust. Conch. G. B. p. 29, pi. 15, f. 29 to 32.— 

 Nils. Moll. Suec. Ter. et Fluv. p. 61. — Sowerby, 

 Conch, Manual, f. 309. 

 LimncBus uuricularius, C. Pfeif. Deutsch. Land and S'lissw, Moll. pt. 1, p. 85, 

 pi. 4, f. 17, 18.— Gray, Manual L. and F.W. Shells, 

 p. 232, pi, 7, f. 1 00. — RossMAssL, Iconog. Land und 

 Siissw. Moll. pt. 1, p. 98, pi. 2, f. 55. — Stein, Schnecken 

 Berlins, pi. 2, f. 12. 

 Limneus acutus, Jeffr, Trans. Linn. Soc. vol. xvi. p. 373. 

 Limnea auricularia, Fleming, Brit. Animals, p, 275. 

 LimntEus 2^creger, var. acutus, G'b.xy, Manual L. and F.W. Shells, pi. 11, 



f. 101 d. 

 Limn(ea „ Gras, Moll. Ter. et Fluv. France, pi. 5, f. 1 , 2. 



Gulnaria auricula, Hartm. Erd und SUssw. Gaster. pi. 16. 



It is the combination of characters, most of which are 

 separately present in the preceding species, that constitutes 

 the specific individuality of L. uuricularius. For one of 

 the many forms of ^x^v'^ger displays the capacious aperture, 

 another that peculiarly rapid volutional increase which 

 effects the disproportion between the penult and antepenult 

 turns, a third the projecting anterior extremity, a fourth the 

 curious twisted gibbous look of its body when examined 

 at its left side, yet collectively these characters give such 

 an aspect to the species that even when the fold is im- 

 perfectly developed, no practical difficulty occurs in the 

 determination of specimens. 



